Metal detector



FIG. 1 is a perspective view of a metal detector showing my new design;

FIG. 2 is a side elevational view from the opposite side thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a metal detector, as shown. 